UNITED NATIONS (AP) — Nikki Haley came to her job as the top U.S. diplomat at the United Nations with no foreign policy experience, but in less than two years she made many friends — even among ambassadors from countries at odds with the Trump administration's policies.

Tuesday's sudden announcement that she was leaving by the end of the year ricocheted through U.N. headquarters like a lightning bolt, with many expressing shock, and some sadness and dismay.

"It was a surprise, not a very pleasant one for me personally," said Russia's U.N. Ambassador Vassily Nebenzia, whose country has clashed...